thorny [ˈθɔ:ni]

以下由轻松背单词网站提供

adj.多刺的，棘手的

describes a problem or subject that is difficult to deal with

The young captain is pondering over a thorny problem. 年轻的上尉正在思考一个棘手的问题。
The boys argued over the thorny points in the lesson. 孩子们辩论功课中的难点。